Share PS plus - what am I doing wrong?

Pr
- in PlayStation
1

My son now has his own ps4. Played on my husband's fortnite. We did account sharing and everything worked out. I tried PS Plus Sharing but I don't get it. My husband's ps4 is secondary, my son's primary. I also updated licenses. If both now want to gamble online (different games), both can't gamble simultaneously with my husband's account. So I wanted to register the other user on my son's ps4 in my husband's PS plus account, because ps plus sharing supposedly works too. However, it always happens that it is not possible because another user is already logged in with the account on this ps4. I also tried to log out or unsubscribe my husband's account on my son's ps4. What am I doing wrong?

ca

So on the second ps 4 where you want to have ps plus on it you have to activate it as primary and on the main PlayStation it should be secondary and you can't play on one account at the same time you have to do it via another account